.page-about {
  --about-rail: 96px;
  --about-cut: 16px;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
}

/* ---------- 首屏 ---------- */
.page-about .hero-about {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 5vw, 56px) 0 clamp(40px, 7vw, 84px);
  background: linear-gradient(158deg, var(--ink-deep) 0%, var(--ink-deeper) 58%, #06211e 100%);
  color: var(--moon);
}

.page-about .hero-about::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(90% 70% at 88% -12%, rgba(227, 167, 47, 0.22), transparent 62%),
    repeating-linear-gradient(90deg, rgba(244, 241, 232, 0.06) 0 1px, transparent 1px 48px);
  pointer-events: none;
}

.page-about .hero-about .breadcrumb {
  position: relative;
  z-index: 1;
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .hero-about .breadcrumb__link,
.page-about .hero-about .breadcrumb__item span {
  color: rgba(244, 241, 232, 0.68);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}

.page-about .hero-about .breadcrumb__sep {
  color: rgba(244, 241, 232, 0.35);
}

.page-about .hero-about__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 32px;
}

.page-about .hero-about .eyebrow {
  margin: 0;
  color: var(--gold);
  font-size: 12.5px;
  letter-spacing: 0.18em;
}

.page-about .hero-about h1 {
  margin: 14px 0 0;
  font-family: var(--sans);
  font-weight: 900;
  font-size: clamp(30px, 5.2vw, 52px);
  line-height: 1.16;
  letter-spacing: -0.02em;
}

.page-about .hero-about__lead {
  margin: 20px 0 0;
  max-width: 48ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.95;
  color: rgba(244, 241, 232, 0.82);
}

/* 切角图框 */
.page-about .cut-frame {
  position: relative;
  padding: 9px;
  background: linear-gradient(150deg, rgba(227, 167, 47, 0.55), rgba(244, 241, 232, 0.06) 54%, rgba(166, 75, 42, 0.45));
  clip-path: polygon(
    var(--about-cut) 0,
    100% 0,
    100% calc(100% - var(--about-cut)),
    calc(100% - var(--about-cut)) 100%,
    0 100%,
    0 var(--about-cut)
  );
}

.page-about .cut-frame--light {
  background: linear-gradient(150deg, rgba(46, 107, 94, 0.45), rgba(201, 207, 198, 0.25) 55%, rgba(227, 167, 47, 0.5));
}

.page-about .cut-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
}

.page-about .hero-about__figure {
  margin: 0;
}

.page-about .cut-frame__cap {
  margin: 12px 0 0;
  font-family: var(--mono);
  font-size: 11.5px;
  line-height: 1.7;
  letter-spacing: 0.06em;
  color: rgba(244, 241, 232, 0.55);
}

/* 首屏数据 */
.page-about .hero-about__stats {
  position: relative;
  z-index: 1;
  margin: 36px 0 0;
  padding-top: 24px;
  border-top: 1px solid var(--line-dark);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 16px;
}

.page-about .hero-about__stat dt {
  margin: 0;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: rgba(244, 241, 232, 0.58);
}

.page-about .hero-about__stat dd {
  margin: 8px 0 0;
  font-family: var(--mono);
  font-weight: 600;
  font-size: clamp(20px, 2.6vw, 26px);
  letter-spacing: -0.01em;
  color: var(--gold-hi);
}

/* ---------- 通用区块节奏 ---------- */
.page-about .section {
  padding: clamp(46px, 7vw, 86px) 0;
}

.page-about .section--tight {
  padding: clamp(38px, 5.5vw, 68px) 0;
}

.page-about .section--moon {
  background: var(--moon);
}

.page-about .section__head {
  max-width: 62ch;
}

.page-about .section__head .eyebrow,
.page-about .about-split__main .eyebrow,
.page-about .about-quality__body .eyebrow {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--clay);
}

.page-about .section__title {
  margin: 12px 0 0;
  font-family: var(--sans);
  font-weight: 900;
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1.28;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .section__lead {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.9;
  color: var(--text-mute);
}

.page-about .about-p {
  margin: 18px 0 0;
  font-size: 16px;
  line-height: 1.95;
  color: var(--ink);
}

/* ---------- 非对称双栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: 28px;
}

.page-about .about-aside {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.page-about .aside-note {
  margin: 0;
  padding: 4px 0 4px 16px;
  border-left: 3px solid var(--clay);
  font-size: 14px;
  line-height: 1.85;
  color: var(--text-mute);
}

.page-about .about-aside--light .aside-note {
  border-left-color: var(--tea);
  color: var(--text-mute);
}

/* ---------- 时间线 ---------- */
.page-about .about-band {
  margin: 32px 0 0;
}

.page-about .about-band img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 3 / 2;
  border-top: 3px solid var(--gold);
}

.page-about .about-band__cap {
  margin: 10px 0 0;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: var(--text-mute);
}

.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 28px 0 30px;
}

.page-about .filter-btn {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  padding: 9px 18px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  clip-path: polygon(9px 0, 100% 0, 100% 100%, 0 100%, 0 9px);
  transition: background 0.16s ease, color 0.16s ease, border-color 0.16s ease;
}

.page-about .filter-btn:hover {
  border-color: var(--tea);
  color: var(--tea);
}

.page-about .filter-btn[aria-pressed="true"],
.page-about .filter-btn.is-active {
  background: var(--ink-deep);
  border-color: var(--ink-deep);
  color: var(--moon);
}

.page-about .about-tl {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-tl__item {
  position: relative;
  display: grid;
  gap: 14px;
  padding-bottom: 30px;
}

.page-about .about-tl__stamp {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 9px;
}

.page-about .about-tl__year {
  display: inline-block;
  padding: 6px 12px;
  font-family: var(--mono);
  font-weight: 700;
  font-size: clamp(17px, 2vw, 21px);
  letter-spacing: 0.04em;
  color: var(--ink);
  background: var(--moon);
  border-left: 3px solid var(--gold);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 9px), calc(100% - 9px) 100%, 0 100%);
}

.page-about .about-tl__panel {
  background: var(--paper);
  border: 1px solid var(--line-soft);
  border-top: 2px solid var(--tea);
  padding: 20px 20px 22px;
}

.page-about .about-tl__panel h3 {
  margin: 0 0 10px;
  font-family: var(--sans);
  font-weight: 800;
  font-size: 18.5px;
  line-height: 1.45;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-tl__panel p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--text-mute);
}

.page-about .about-tl__facts {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
}

.page-about .about-tl__facts li {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  padding: 4px 9px;
  border: 1px solid var(--line);
  color: var(--text-mute);
}

/* ---------- 团队分工 ---------- */
.page-about .about-team {
  margin-top: 34px;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-team__card {
  background: var(--paper);
  padding: 26px 22px 28px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .about-team__card:nth-child(2) {
  background: var(--tint-tea);
}

.page-about .about-team__num {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--clay);
}

.page-about .about-team__card h3 {
  margin: 0;
  font-family: var(--sans);
  font-weight: 800;
  font-size: 19px;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-team__card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--text-mute);
}

/* ---------- 质量机制 ---------- */
.page-about .about-quality {
  display: grid;
  gap: 30px;
}

.page-about .about-quality__figure {
  margin: 0;
}

.page-about .about-quality__cap {
  margin: 12px 0 0;
  font-family: var(--mono);
  font-size: 11.5px;
  line-height: 1.7;
  letter-spacing: 0.05em;
  color: var(--text-mute);
}

.page-about .about-steps {
  list-style: none;
  counter-reset: about-q;
  margin: 26px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-steps li {
  position: relative;
  counter-increment: about-q;
  padding: 16px 0 16px 44px;
  border-bottom: 1px dashed var(--line);
}

.page-about .about-steps li::before {
  content: counter(about-q, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 18px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--clay);
}

.page-about .about-steps strong {
  display: block;
  font-family: var(--sans);
  font-weight: 800;
  font-size: 15.5px;
  color: var(--ink);
  margin-bottom: 5px;
}

.page-about .about-steps span {
  display: block;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--text-mute);
}

.page-about .about-quality__note {
  margin: 20px 0 0;
  padding: 14px 16px;
  background: rgba(46, 107, 94, 0.08);
  border-left: 3px solid var(--tea);
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink);
}

/* ---------- 覆盖范围 ---------- */
.page-about .cover-panel {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 4.4vw, 48px);
  background-color: var(--ink-deep);
  color: var(--moon);
  clip-path: polygon(
    20px 0,
    100% 0,
    100% calc(100% - 20px),
    calc(100% - 20px) 100%,
    0 100%,
    0 20px
  );
}

.page-about .cover-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(244, 241, 232, 0.32) 1.3px, transparent 1.4px);
  background-size: 24px 24px;
  opacity: 0.5;
  -webkit-mask-image: radial-gradient(120% 100% at 10% 6%, #000 18%, transparent 76%);
  mask-image: radial-gradient(120% 100% at 10% 6%, #000 18%, transparent 76%);
  pointer-events: none;
}

.page-about .cover-panel__head {
  position: relative;
  z-index: 1;
  max-width: 58ch;
}

.page-about .cover-panel .eyebrow {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.page-about .cover-panel .section__title {
  color: var(--moon);
}

.page-about .cover-panel__lead {
  margin: 16px 0 0;
  font-size: 15.5px;
  line-height: 1.9;
  color: rgba(244, 241, 232, 0.78);
}

.page-about .cover-list {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  border-top: 1px solid var(--line-dark);
}

.page-about .cover-list__row {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 16px;
  align-items: baseline;
  padding: 15px 0;
  border-bottom: 1px solid var(--line-dark-soft);
}

.page-about .cover-list__num {
  font-size: clamp(19px, 2.4vw, 25px);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--gold-hi);
}

.page-about .cover-list__text {
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(244, 241, 232, 0.82);
}

/* ---------- 荣誉与路线 ---------- */
.page-about .about-split--reverse {
  align-items: start;
}

.page-about .about-honor {
  margin-top: 24px;
  border-top: 1px solid var(--line);
}

.page-about .about-honor__row {
  display: grid;
  grid-template-columns: 86px minmax(0, 1fr);
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-honor__key {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--tea);
  padding-top: 3px;
}

.page-about .about-honor__val {
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
}

/* ---------- 收尾 ---------- */
.page-about .about-next {
  background: linear-gradient(160deg, var(--ink-deep), var(--ink-deeper));
  color: var(--moon);
}

.page-about .about-next .eyebrow {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.page-about .about-next .section__title {
  color: var(--moon);
}

.page-about .about-next .section__lead {
  color: rgba(244, 241, 232, 0.78);
}

.page-about .about-cta {
  margin-top: 32px;
  display: grid;
  gap: 14px;
}

.page-about .about-cta__card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 24px 22px 26px;
  background: rgba(244, 241, 232, 0.05);
  border: 1px solid var(--line-dark);
  text-decoration: none;
  color: var(--moon);
  clip-path: polygon(14px 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%, 0 14px);
  transition: background 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}

.page-about .about-cta__card:hover,
.page-about .about-cta__card:focus-visible {
  background: rgba(227, 167, 47, 0.14);
  border-color: var(--gold);
  transform: translateY(-3px);
}

.page-about .about-cta__card:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

.page-about .about-cta__tag {
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-about .about-cta__title {
  font-family: var(--sans);
  font-weight: 800;
  font-size: 18px;
  line-height: 1.45;
  letter-spacing: -0.01em;
}

.page-about .about-cta__text {
  font-size: 14px;
  line-height: 1.85;
  color: rgba(244, 241, 232, 0.72);
}

/* ---------- 媒体查询 ---------- */
@media (min-width: 760px) {
  .page-about .hero-about__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .cover-list__row {
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 24px;
  }
}

@media (min-width: 820px) {
  .page-about .about-tl__item {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: 40px;
    padding-bottom: 38px;
  }

  .page-about .about-tl__item::before {
    content: "";
    position: absolute;
    top: 12px;
    bottom: -4px;
    left: calc(var(--about-rail) + 19px);
    width: 1px;
    background: linear-gradient(180deg, var(--line), var(--line-soft));
  }

  .page-about .about-tl__item:last-child::before {
    display: none;
  }

  .page-about .about-cta {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .hero-about__grid {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: center;
    column-gap: 56px;
  }

  .page-about .about-split {
    grid-template-columns: 1.4fr 0.6fr;
    column-gap: 56px;
    align-items: start;
  }

  .page-about .about-split--reverse {
    grid-template-columns: 1.25fr 0.75fr;
  }

  .page-about .about-quality {
    grid-template-columns: 0.85fr 1.15fr;
    column-gap: 52px;
    align-items: start;
  }

  .page-about .cover-list__row {
    grid-template-columns: 140px minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-cta__card {
    transition: none;
  }

  .page-about .about-cta__card:hover,
  .page-about .about-cta__card:focus-visible {
    transform: none;
  }
}